The Yii2 guide can be newer then the release?

I was looking for help in the guide and found that AssetBundles support declaration of ‘only’ in the $publishOptions. At least, I thought that. After some time (hours) I found out that this feature is documented but not yet released (will be with 2.0.5).

That bothered me a bit and I thought: couldn’t the guide be released with a new version? Or could that be improved in another way?